Printing plate for duplicating machines



sept. z8 192s. 1,601,287 Y G.. BERTINETTI PRINTLNG PLATE FOR DUPLICATINGMACHINES A Filed Jan. 25. 1926 Patented Sept. 28,` 1926.

UNITED STATES GIOVANNI BERTINETTI, OF TURIN, ITALY.

:PRINTING PLATE FOR DUPLICATING MACHINES.

Application led January 23, 1 926, Serial No. 83,320, and in ItalyJanuary 29, 1925.

The present invention relates to duplieating machines vfor reproducingwritings, typewritten matter and the like, and it has for its object theprovision of the printing plates to be used in said duplicating machinesby the aid of a thin metal sheet said sheet being adapted to be acted onby means of a style or the like or to be inserted in the platen carriageof, a typewriter to receive impressions which produce correspondingreliefs adapted to act as printing means on the printing plate thusobtained being arranged for use in a duplicating machine.

According to the present invention use is made for producing a printingplate of said kind of athin sheet of a metal having a thickness between5/100 and 2/10 of a millin metre.

According to a feature of the present invention use is made for such apurpose of a soft or annealed aluminium sheet having a thickness between0.05 and 0.20 millimetre.

It has been found that by using an aluminium sheet having a thickness of0.08-009 of millimetre in a usual typewriter very sharp reliefs `may beobtained without affecting the typewriter types, the printing plate thusobtained lbeing able to withstand satisfactorily the printing pressurewhen it is used in known duplicating machines in. which the materialtobe printed is pressed against the printingplate with an intermediateinking sheet or after said printing plate having been inked. v

Soft or annealed aluminium sheet has been found particularly useful inthis connection because of its known property of hardening 'at' thepoints where it is acted on and extended by the impact action of thetypes or by pressure of the style, the relief portions thus produced inthe sheet being made hard and enabled to withstand printing pressure.4

Therefore a very large number of clear and sharp prints may be obtainedby means of printing plates according to the present invention For theurpose of producing a printing plate accor ing to this invention, analuminium sheet of the described character is located on a softsupporting layer,- as a rubber.` sheet, and depressions are producedtherein by means of a style or the like.

Otherwise the said sheet of aluminium is located on the platen of ausual typewriter, like a usual paper sheet, With a soft sheet, as arubber sheet, between the said aluminium sheetv and platen, and then thetypewriter is actuated in the usual manner, the inking ribbon of thesame being obviously made inoperative.

The figure of the ,annexed drawing shows by way of illustration infragmentary and perspective view a printing plate obtained in thedescribed manner, the sheet 1 having reliefs 2 obtained as abovedescribed'.

For use the printing plate thus obtained is inked and pressed againstthe materal toy be printed, or it is forced a ainst said material withan intermediate inking sheet, as well known inthe art.

'What I claim as my invention and desire to secure by United StatesLetters Patent 1s:--

1. A printing plate for duplicating ma- 'chines and the like consistingof a thin sheet of soft or annealed aluminium said sheet being embossedto provide printing reliefs.

2. A printing plate for duplicating machines and the like consisting ofa sheet of aluminium having a thickness between 0.05 and 0.2 millimetre,said sheet being embossed to provide printing reliefs,

3. A printing p ate for duplicating machines and the like consisting ofa sheet of soft or annealed aluminium having a thickness between 0.05and 0.2 millimetre and embossed to provide printing reliefs, the

-met-al of said sheet being made hard in said embossed portions byaction of impact or pressure. i

In testimony whereof I aix my signature.

eiOvANNi BERTINETTL

